576x = difference in clock cycles per second
200,000x = claimed difference in performance
Two totally different animals.
How deep was the pipeline on the old bird? How many registers? FPU? Memory access time? L1-L3 cache? Advances in OS and compilers (probably offset somewhat by sloppier programming). What about swapping?
Ah... no.
Read the article again.
The relevant line is: My current desktop PC is on the order of 200,000 times faster.